Gasketed joint



Much 6, 1951 mmm. ml amm ..1.m` nl Patented 6 NfroFFlc chaman Jom'rBarry Gann. East Orange,

A. l. Smith Manufacturing@ N. J., signor to The mpany, East Orange, N.J., a corporation o! New Jersey l y Application October l2, 1946, SerialNo. 702,907

o v lrk This invention relates yto y improvements in gasketed Joints. y

An object oi the invention is to provide a gasketed iointwhich'iurnishes an efllcient seal between flanges and which minimizesdanger of breakage during tightening up on the bolts .or other membersby which the flanges are -held together and the gasket is compressed.

Another object of the invention is to provide a seal which is readilyapplied in the ileld.

A further object oi the invention is to provide a gasket of high sealingeiilciency but which is cheaply manui'acturable in a variety oi' formsfor diierent applications.

With these and other objects which will appear in the following fulldescription in mind, the invention consists in the combinations andarrangements of parts, and details of construction which will now ilrstbe fully described in connection with the accompanying drawing and thenbe more particularly pointed out in the appended claims.

In the drawing:

Figure 1 is a plan view of a pipe sleeve coupling and pipe sectionscoupled thereby;

Figure 2 is a section through the sleeve ot Figure 1 and is taken on theline 2 2 oi Figure 1;

Figure 3 is an enlargement of a portion of Figure 2, showing the angesand gasket prior to compression of the latter;

Figure 4 is a view similar to Figure 3 but showing the gasketcompressed; and

Figure 5 is a fragmentary isometric of one end of the gasket of theprevious figures.

Figure 1 shows a split sleeve i joining two pipe sections, 2 and l. Thetwo halves oi' the sleeve are held together by bolts 4 and cooperatingnuts 5 (Figures 2 and 4), the bolts passing through bores 6 in thecooperating sleeve flanges and through bolt holes 1 in the gasket l. Themeansl by which the sleeeve I is sealed to the pipe sections 2 and l (aswell as the pipe sections themselves in Figs. 2 and following) areomitted from the drawing since these may be any of the conventionalmeans known in the art and iorm no part of the present invention.

While the gasketed Joint has been shown as applied to a sleeve. it willbe understood that it may be utilized in any jointed construction wherel the parts are fastened together by means ot a flange on one or bothmembers, such iiannge or iianges being external of an enclosed spacewhich istobesealed. Thegasketlisi'ormedofleador other similarcompressible material and where the gasket is straight, as is the casein joining a sleeve. it may be formed very simply as an extruded 4 cum.(ci. zas-194) which the bolt pressure works strip. More complex shapesmay require different processes of manufacture.

'I'he gasket I is generally ilat and of uniform thickness but isthickened to one side by means of the transversely spaced ridges l sothat this side is serrated and of greater average thickness than theother. The specitic form of the ridges i and the speciiic way in whichthe gasket is serrated are not critical.

In making the joint. the sleeve elements are assembled together with thegasket and bolts as shown in Figure 3 and the bolts are tightened tocompress the gasket and crush the ridges 9 thereof, as shown in Figure4, forming a tight seal between the coupled ilanges and the gasket alongthe inner side oi.' the latter (the left side in Figures 3 to 5,inclusive).

It will be noted that the serrated or ribbed area of the gasket is oi.'less width than the ilanges, which increases the crushing force of thebolt pressure exerted upon the flanges. per unit area of gasket sealingsurface and thus increases the emcie'ncy of the seal for given boltpressure. Secondly, the serrated area of the gasket, which is of greateraverage thickness than the remainder and which is crushed by theapplication of pressure. is located inwardly of the joint or line ofapplication of pressure by the bolts. In consequence, when the bolts aretightened up enough to subject the ilanges to a strain capable ofdeforming them, even slightly, the flange surfaces adjacent the boltswill be brought somewhat closer together than the ilange surfaces lyinginwardly and in contact with the serrated portion of the gasket.Accordingly, pressure will now be exerted on the at solid area of thegasket lying close to the bolts and either inwardly or outwardlythereof, approximately at the respective locations P and Q. As soon asthis deflection and pressure transference has occurred. the fulcrumagainst in its tendency to iiex the flange is shifted to a point closeto the point of application oi' the pressure and the bending momentwhich tends to fracture the flange is reduced to a small lfraction ofwhat it would otherwise be. In this way, an eiiicient seal underpractical bolt pressure is provided and danger oi fracture oi a ilangedue to'excessive bolt tension is eliminated or substantially reduced.

What is claimed is:

l. A gasketed Joint comprising a ange, a member to be joined thereto,bolts for-drawing said flange and member together, a gasket of lead orsimilar material between said flange and member, the said gasket havinga serrated and crushabie inward portion of the gasket to form a seal andfurther tightening exerts pressure on the outer h pressure-sustainingportion or the gasket.

2. :A gssketed joint comprising cooperating ilanges. bolts for' drawing.nsnges together,

a. gasket of leed or similar iianges. tbe said gasket having yaiserrated and crushableportioninwardlyotsaidboltsandan outer boltpressure-sustaining portion of lees thickness than the average thicknesso! said serrated portion, whereby tightening the bolts iirst crushes thesaid inward portion o! the gasket toformasealandturthertighteningexertspressure on the outerpressure-sustaining portion of the sasket.

3. A gssketed pipe sleeve Joint comprising sleeve sections havingcooperating ilanges, bolts for drawing said mmges together, e. gasket o!lead or similar material between said iianges, the said gasket beingformed as a strip having a serrated and crushable portion inwardly ofthe line or the said bolts and an outer pressure-summing portion of lessthickness than the average thick- 4nessotsddserratedportiomwhsrebyshtmingtheboltsiirstcrushesthssaidinwardportionoithegaskettoiormaseaisndmnhsrtilhteninsexertspressureontheonterps-emm-mltainins portionotthegasket.

4. Agasket invingapluraiity etbolt helmaserratedandcnbableportiontoonesidsorthe said bolt holes and a solid boltprendre-metaluingportionalongthesaidbolthoissandtothe other sidethereof. whereby crushing `pressure ms'yfbapplied rtothe saidrserratedportion by members Joined with bolts saidbolthoiesandtheloadmaybehhnbytbesolid preesureportion upa:rurtherllhtening.

namur am.

ness crrm Theiollowingreierencesareofreeordinthe nleofthispatent:

l UNITID STATE PAmTB

